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Income Taxes (Details Textual) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
May. 31, 2013 | May. 31, 2015 | May. 31, 2014
Income Taxes (Details Textual) [Abstract] |  |  |
Total reserve for uncertain tax positions |  | $ 29.1 | $ 29.8
Total reserve for uncertain tax positions included in long-term liabilities |  | 29.1 | 28.6
Reserve for uncertain tax positions, increase in May 2013 | $ 21.2 |  |
Impact of uncertain tax positions, if recognized, on company's effective income tax rate |  | $ 29.1 | $ 24.6

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- Definition Liability for uncertain tax positions current and noncurrent. + References No definition available. + Details
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- Definition The noncurrent portion of the amount recognized for uncertain tax positions as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The net amount of all increases and decreases in unrecognized tax benefits for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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